Manual 26166V1
MicroNet Simplex & MicroNet Plus
Woodward
96
8.4—48 Channel Discrete Input Module
8.4.1—Module Description
Each 48 Channel Discrete Input (48Ch DI) Module is connected through two low density discrete cables
to two separate FTMs. There are two types of FTMs available for use with the 48Ch DI Module; the 24
Vdc Discrete Input/Output FTM and the Discrete Input (With LEDs) FTM (see Chapter 13 for additional
information on this FTM module). The 24 Vdc Discrete Input/Output FTM doesn’t have LEDs and the
Discrete Input (with LEDs) FTM has LEDs. All I/Os on the module are accessible on the FTMs, and the
channels are labeled sequentially to correspond to their software locations (for example, discrete input 1
on the FTM will be discrete input 1 in the application software).
Figure 8-11. Discrete Input Module
This module receives discrete signals from 48 separate switches or relay contacts, and sends this data to
the CPU. The inputs are optically isolated from the balance of the MicroNet control circuitry. The module
system provides is24 Vdc power for these external contacts on the 24 Vdc Discrete Input/Output
FTM. The Discrete Input (With LEDs) FTM requires an external contact wetting power supply.
There are no potentiometers for tuning and requires no calibration. A module may be replaced with
another 48Ch DI Module of the same part number without any adjustment.
Released
